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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6dc63189c8ad40ccc0851a2d5e8b0abcac3dd3dcecfce670cfe7fc9c15d486d' 
  AND token = 'OiTUHMORcqemlsNhTWKZbExT98rk+iQa0j/BHHeUWCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}